Chemistry Review final
Which of the following conversion factors would be most useful in converting miles per gallon to kilometers per liter?
1 mile/0.62 km
How many milliliters are there in 1.0 microliter?
1.0 x 10-3 mL
Look at the graph above. What is the temperature at an elevation of 200 meters?
19 degrees Celsius
A sample of gold has a mass of 15.7 g and displaces 0.81 cm3 of water in a graduated cylinder. What is the density of gold?
19.3 g/cm3
Use the conversion factor above to find the meters in 2.7 x 103 kilometers.
2.7 x 106 m
In the chemical reaction shown below, what is the beginning mass of mercuric oxide?
216 grams
The sum of 4.824 + 2.03 + 4.72319 + 123.4567 + 111.1 expressed to the proper number of significant figures is
246.1
How many significant figures will there be when the density value is calculated from the following data? mass = 24.47g; volume =13.2 mL
3
What is the percent error if a measured value is 24.59 g/mL and the accepted value is 25.49 g/mL?
3.5%
What is the temperature 51°C expressed in kelvins?
324 K
Look at the graph above. What is the approximate magnesium content of a baked potato?
50 mg
Consider the table above. In a sample of 100.0 grams of sucrose, what would be the expected mass of hydrogen?
6.50 grams
Look at the graph above. Which two substances are responsible for over half the chlorine in the stratosphere?
CFC-12 and CFC-11
What scale provides the base unit for temperature in the SI system?
Kelvin scale
In the figure above, the volume of hydrogen gas is twice the volume of oxygen gas. What is the mass relationship between hydrogen and oxygen gas?
More information is required.
A heterogeneous mixture is poured through a piece of filter paper that is positioned over a beaker. What is the substance that is collected in the beaker?
Not enough information is given.
Why are plus and minus signs ignored in calculating percent error?
Only the size of the error matters, not whether the values in error are larger or smaller than the accepted values.
Why can an object's weight vary with location but its mass cannot?
Weight is a measure of both mass and the effect of Earth's gravitational pull on the matter. Mass measures only the amount of matter.
A characteristic that can be observed or measured without changing the sample's composition is ________________.
a physical property
The closeness of an experimental value to an accepted value is its ______.
accuracy
A solution of solids is a(n)___________.
alloy
Chemists whose specialty is determining the composition of chemicals work in the field of ________.
analytical chemistry
Research on solubility as a factor that affects the digestion of foods in humans would be an example of ______________.
applied research
2.In the SI system of measurement, there are seven ________ units
base
When one substance changes identity, it exhibits a(n) __________.
chemical property
The representation of data on graph that resembles a pizza is a _________.
circle graph
________ is a separation technique that produces highly pure solids.
crystallization
Which of the following is not a state of matter?
density
A technique that uses the differences in boiling point to separate homogeneous mixtures is _________.
distillation
A tentative explanation for a series of observations is a
hypothesis
Density =
mass/volume
Which of the following physical properties is not paired with the correct SI base unit or measurement?
mass: gram
Anything that has mass and takes up space is _________.
matter
Which of the following is not evidence of a chemical reaction?
melting
Which of the following materials was discovered by chance during research on artificial fiber creation?
nylon
Which of these is not a homogeneous mixture?
oil and vinegar salad dressing
What branch of chemistry is most concerned with the study of carbon compounds?
organic chemistry
A(n) ____________ is a transition from one state of matter to another.
phase change
Research that is conducted for the sake of increasing fundamental knowledge is __________.
pure research
The type of data that is descriptive in nature is ___________.
qualitative data
In the chemical reaction shown below, how do you classify hydrogen and oxygen?
reactants
Two items that must be worn during any laboratory experiment are ___________.
safety goggles and a lab apron
How is the slope of a linear graph calculated?
slope = (y2 - y1) / (x2 - x1)
Which of the following is a pure substance?
steam
Which of the following is a vapor?
steam
The variable that you plan to change during the course of an experiment is ___________.
the independent variable
The general term for a systematic approach used in scientific study is ___.
the scientific method
In table 3.5, why are the mass ratios of copper to chlorine not the same for compound I and compound II?
the two compounds are not the same
When an explanation has been supported by many experiments, the explanation is a __________.
theory
Dimensional analysis is a method of problem-solving that focuses on ________ .
units
When a laboratory session ends, you must always ___________.
wash your hands
Which of the following is a compound?
water
Periods are ___________ on the periodic table.
horizontal rows
Which of the following numbers is equal to 2.70 x 10-4?
0.00027
How can the law of conservation of mass apply to a burning log, if all that remains of it is ash?
The masses of the gases and water vapor released into the air by the combustion reaction plus the mass of ash equal the mass of the log before burning.
Which of the following releases matter?
engaging a car exhaust system